The National Park Service is deploying hydrogen peroxide in the Lincoln Memorial Reflecting Pool to combat algae growth, according to a Department of the Interior (DOI) spokesperson. This effort follows the Trump administration's controversial $13.1 million renovation of the iconic water feature on the National Mall. These renovations included repainting the base of the pool "American flag blue" and mending leaking joints. Videos shared on social media on Tuesday morning depicted workers dumping gallon bottles of the chemical into the 2,028-foot pool, which has turned green due to the algae bloom. The park service is using hydrogen peroxide in addition to an advanced filtration system that deploys ozone-injected nanobubbles to break down toxins and contaminants in the pool, the DOI spokesperson said.